tls: Clean up module

 - Remove unused debug code
 - Remove unused imports

mbedtls/tls.pyx

@@ -4,9 +4,6 @@ __author__ = "Mathias Laurin"
 __copyright__ = "Copyright 2018, Mathias Laurin"
 __license__ = "MIT License"
 
-cdef int __DEBUG = 0
-cdef int __DEBUG_ALL = 0
-
 from libc.stdlib cimport malloc, free
 
 cimport mbedtls._net as _net
@@ -15,9 +12,6 @@ cimport mbedtls.pk as _pk
 cimport mbedtls.tls as _tls
 cimport mbedtls.x509 as _x509
 
-if __DEBUG | __DEBUG_ALL:
-    from binascii import hexlify
-
 import socket as _socket
 from collections import namedtuple
 try:
@@ -31,7 +25,6 @@ except ImportError:
     # Python 2.7
     from contextlib2 import suppress
 from enum import Enum, IntEnum
-from ipaddress import ip_address
 from itertools import tee
 
 import certifi

requirements-27.txt

@@ -1,4 +1,3 @@
 contextlib2==0.5.5
 enum34==1.1.6
 pathlib2==2.3.2
-py2-ipaddress==3.4.1